Truing jewel settings



VPatented Get. 2, 1923.

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CHARLES E. DE LONG, or SPRINGFIELD, ILLIiiToIsfvV Y Y Taurus-JEWEL sET'rrnGs;

Appliationmea september 12, 1921.V serial No; 499,920. i Y I To @ZZ/07mm it myioonoef/ab n y j Be it known that I, CHARLES DnLoNG, a'citizen of the United States, residing 'at I i Springlielchin the county of Sangamon and 5 State orflllinois, have invented a newf and useful Appliance for Truing Jewel Settings, o'rwhijchY the following is aspeciication.r j p A The linvention relates to instruments for truing thejewel-settings of watches or other'V setting, may ber attained; .to provide a jewell setting .truing-device adapted` ,for use in conjunction with usual watchmakers lathes, capable of rapid and accurate operation and obviating the ditcult and unsatisfactory shellac process hitherto commonly i n used in jewelisetting; to provide a barrel normally in line with and supportedbytlie tail-stock *andY equipped, withV 1a fslidable spring-actuated plunger. having pivots in line'lwith the axis of the rotative split chuck holding the jewel-setting; to-.provide ayoke and appurtenances connecting` the barrel withthe tail-stock spindle in a manner admitting of slight oscillative movement of the end of vthe barrel relatively to the common axis of the tail-stock spindle and the splitchuck; to provideinv conjunction with the barrel af tool holder radially adjustable relatively .to the barrel; and to provide other improved structural details. 'A

. The linvention is illustrated in the accompanying drawingA and will now be described in detail and the novelfeatures thereof will be recited in the claims.V i

, Figure 1 is aside-elevation of a jewelsetting truing-appliance embodying my invention, j shown in operativek relation Vtol a watch-niakers lathe; Y j j Y Y AFig-2 is a greatly enlarged longitudinal axialv section through the same jewel-setting truing-appliance; and

. Fig. 3 is an enlarg the detached plunger. y Y y Y The saine reference nuineralsdesignate the saineparts in all theviews. j Y

` The lathe bed, the head-stock, thesplitd perspective view of chuck 7, the tail-stock'Sand thetail-stock spindle 9 `are of usual construction.

The steel barrel 1() is preferably of the 'eX- ternal formshown in Fig. landY has a 'longitudinal smooth bore12L 'extending the greater part of the lengthfof the barrel and a relatively short reduced internally screwthreaded bore 13 receiving-a screw AMvcof- 'i axial'with the barrel. Y Y Y A bushing. 15 isvpitte'd inthe bore 12 is secured by ascrew 18; 1' l" he plunger fslides inv the Alongitudinal bore offthe'bushingv and has a fiat .part '3a' and'alsohas at each end a pivot 1 6 adapted` 'Y to enter the hole ina jewel-4t. i E j `A pin 17 driven *inv a. hole in the wall of the bushin has its innerl end near but not touching t e flat face -Sfo't the plunger.v The pin prevents rotation ,but does `not intertere with free slidingof the plunger-in the bushing.V lIn case Vone of the'v pivots n16 becomes worn or damaged theplunger be reversed and tlieother pivot maybe used.

A follower-19 Sliding freeiyin'the bore Y12 has a centra'lrhole20 receiv'ing.'the. pivot;A 16 of the plungerY 3 andthe follower sur rounding the pivot protects' it from injury.V

A coiled spring y21 occupies thebore 12, is compressed by` inwardl inrov'einenty of the follower upon inward sliding ofthe plunger and actsjto slide the followe'routwardly to cause'foutward sliding of theplunger.

.The yoke 22 has al tapered shank 23' which engages in atapered socket 24 in theV tailstock spindle `9 and j hasV va tapered hole 25 through which the screw 14' extends. -The.

forni ofthe hole 25per1nits slightV oscillative movement of the screw in' the hole. A pin 26' ixed .in the body of the yoke extends into a slightly largerv -hole 27 in the body of the barrel.Y rlhe-pin-an-d-hole connection permitsA slight oscillative'` movementv of ltlie barrel, but keeps it from 'rotating relatively to, thel yoke." 'A spring 28si1rrounds2the screw 14:@` Slight oscillationof'the barrel 10 stressesthefspring andthe spring normally actsV toV keep' the barrel horizontal,

with thepivots 16 of-the plunger 3V inline :Y with the axis of the Chuck 7 so that when the tail-stock spindle 49 is lpushedinwardly Y the pivotl will enter the hole inthe jewel 4 mountedV in lthejewel-setting 29V held the chuck 7. Y

AA spring steel tool-holder is parallel to the barrel and is secured thereon by a y screw 31. The tool holder has longitudinal member which extendsiinto a longitudine 'slot 36 in the boay @i the barrel 10. The member 35 moves in the slot 36 to guide outward-radialmovement. ofthe tooll holder relatively to the longitudinal axis of the barrel, and the member engaging on the side walls of the slot prevents lateral vmovement of the tool holder. The tool hold- Gr'has valso in clined'wa'y 3 7 accommodating'the'ciitt'ing ltool 33. "Thetoolima'y beset f through"v holder and screw bears on the barrel. Upon advanc-v -H defi-@reef PQStOnS in the my??? er@ .my be secured by the screw 34.VV

The screw 32 screws into and* extends thelend of ,the

ing the s ,crevyinwardly the tool holder will move outwardly moreior less, according to the movement of the. screw, and Vupon retracti'ng the scirewfmore or less, the tool holder will spring'inwar'dly; and thus .the

cfuttingedge ofthe tool may be accurately adjusted'relatively lto Athe circumference' of the Yrotating setting`29 land relatiyely tothe axisof the/pivot Y' l16 around which the setandthe'jewel thereinrotate, re-V sul-ting in accurate truingV ofthe circurnter# ence of the jewel-setting relatively cto" 4the l centrefof lthe hole iii the jewel. l

"It will nowi'be observed that under these f. circumstances the pivot'lti and tool holder 3,0'are'rboth supported on Vafmember which member, soV 'that -.D0YeIIent A'oit pivot 1,6

will accompanied by.V ycor,responding nievementV of the toelVK holder.

The appliance herein lsetfitorth 'is specially designed for'use'in Ywat-'ch factories f tubiiles', each Lof@suitablel length for a jewel-setting; counter-boring the respecy tive i tubules to 'form in "eac-h recess adapted to receive a jewel; and f spinning'the inside rini of theV setting toA secure the jewel'in the setting. The'holes'drilled inthe plates otra watch' to receive the jewel? settings must be accurately located'- rela# tively to each other Kand accurately calir brated to receive' the -respective jewel-set- Se. the we in the seing so @hatte axis of thehole in 'the jewel will accurately coin cidefwith' theaxfoffthe setting. Lt" is thereto're" 'necessary'tof true the setting with reference to the hole in the jewel so that In practice, it is 'found very difficult yte when the setting, after ybeing trued, Ais placed inthe proper hole in the plate, the hole of the plate, the setting contained in the hole, and the jewel contained in' the setting will all'be absolutely concentric.

When the barrel and appurtenances are assembled as described, the shank 23 will be (inserted inthe socket 24 or" the spindle 9. The jewel-'setting'to be treated will be placed in the chucl; 'Tand'.the spindle on the head-stock will be rotated in the 'usualiman ner to effect rotation of ltheijewel-setting. The spindle 9 will then be pushed inwardly by Yhand to cause thebutwiardly projected laV pivot 16 to enter the holev in the jewel mounted in the setting andthereuponY setting and its jewel will rotate 'around the pivot. The arm 30 having been previously adjusted by means ol' the'screw 32 and the i001 33 having been rrezvioslyedjtefl secured'in the way 37, thep'ointotthe tool will be in position to true the vci rcuniterence of the jewelsetting so that the o f the jewel-setting will exactly coincide with the axis of the hole in lthe jewelll 4The spring 28 acting on the screw 145 Awill to keep the projectingend .of the pivotl Vin line with the axis of the'headfstocl;

that whenV the jewel-setting is in place the rotating Vsplit-.chuck Vno manipulation o f the `barrel'will'loe''necessaryxtov aline :the point oli 'the p'ivot'lti` with the hole in'tl'ie jewel. lt 'will be obvious, under'these cunistancesthat the pivot 16Y actsasa een# ter of 'revolution forthe jewel, and` `ifts Y Y ting so that when the cutting'tool'ltraiveises the circumference of theV settingthe latter' is mede truly .C'Qientre offhy 1101@ the' jeWeL y, t I do not wish toyrestrict the claims tothe precise -'details construction herein shown and described since( it: isobvioiis thatfother and varied inean's'for'rotating'the jewellset ting" and the jewel mounted therein around the' longitudinal axis yota yielding pivot maybe'used and still lieep'iwithin'thescope f of the claims.

Y -laving fully described vmy invention what l claim as new and desire to secure by Letters Patent is:

with respect tothe holev in th e "jewelV mounted in the setting, comprising means l. The means forV trumg a jewelsetting for rotating' the setting on its axis;V alnonrotative s lidable element having a pivot adapted to enter thev holeinl'theijewel'; and v a cutting tool mounted dnsaid non-'rotaff tive element and cutting thel circumference ot the setting'whilel the setting is rotating u around the pivot in lhole' offthe'jewel.

2. In an appliance tor truing'jewel-settings, a non-rotative barrel having Ya" lengitudinal bore, in combinationwitha vyielding plunger sliding in the bore of the barrel and having a pivot adapted to enter the hole f in a jewel, to permit rotation of the jewel and its setting around said pivot, and a cutter carried by the non-rotative barrel and engageable with the circumference of the jewel setting. Y

3. Inan appliance for truing jewel-settings, a non-rotative barrel having a longitudinal bore, in combination with a reversible yielding plunger slidable in the bore of the barrel and having at each end a pivot adapted to enter the hole in a jewel, to permit the jewel and its setting to rotate around either pivot of said plunger. 4. In an appliance for truing jewel-settings, in combination with a non-rotative barrel having a longitudinal bore; a coiled spring in the bore of the barrel; a follower free to slide in the bore of the barrel andV movable outwardly by said spring; and an inwardly sliding plunger engaging said follower to compress said spring. v

5. In an appliance for truing jewel-settings, in combination with va non-rotative and slightly oscillative barrel having a longitudinal bore; a yielding plunger havinga pivot in line with the axis of the bore of the barrel and adapted to enter the hole in a jewel; and yielding' means normally effective to maintain horizontally of Ythe barrel. v

6. In an appliance for truing jewel-settings, the combination of a yoke having an barrel havingfa longitudinal bore; a spring-- pressed plunger slidable in the bore ofthe barrel and having terminalV` pivots adapted to enter the hole in a jewel; a tool-holder capable of radial adjustment relatively toV the axis of the barrel; and acutting tool capablefof radial and longitudinal adjust ment relatively to the outwardly extendedpivot of the plunger.

8. A tool for truing the exterior of jewelsettings concentric tothe hole in the jewel and comprising a floating member adapted i to be carried bythe tail stock of a lathe, a

centering device adapted to enter the hole in a jewel and carried by the loatingmenb ber, and a cutter carried by said floating member and adaptedy to operate on the circumference of a jewel setting.

' Signed at Springfield, Sangamon'Count-y,

Illinois, thisv 8th day of September, 1921.

CHARLES' E. DE LONG. Witnesses:

EDWARD P. BARTLETI, GEORGE W. SMITH. r 

